src/main/java/org/mariadb/jdbc/MariaDbDatabaseMetaData.java [898:924]:
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    String sql =
        "SELECT KCU.REFERENCED_TABLE_SCHEMA PKTABLE_CAT, NULL PKTABLE_SCHEM,  KCU.REFERENCED_TABLE_NAME PKTABLE_NAME,"
            + " KCU.REFERENCED_COLUMN_NAME PKCOLUMN_NAME, KCU.TABLE_SCHEMA FKTABLE_CAT, NULL FKTABLE_SCHEM, "
            + " KCU.TABLE_NAME FKTABLE_NAME, KCU.COLUMN_NAME FKCOLUMN_NAME, KCU.POSITION_IN_UNIQUE_CONSTRAINT KEY_SEQ,"
            + " CASE update_rule "
            + "   WHEN 'RESTRICT' THEN 1"
            + "   WHEN 'NO ACTION' THEN 3"
            + "   WHEN 'CASCADE' THEN 0"
            + "   WHEN 'SET NULL' THEN 2"
            + "   WHEN 'SET DEFAULT' THEN 4"
            + " END UPDATE_RULE,"
            + " CASE DELETE_RULE"
            + "  WHEN 'RESTRICT' THEN 1"
            + "  WHEN 'NO ACTION' THEN 3"
            + "  WHEN 'CASCADE' THEN 0"
            + "  WHEN 'SET NULL' THEN 2"
            + "  WHEN 'SET DEFAULT' THEN 4"
            + " END DELETE_RULE,"
            + " RC.CONSTRAINT_NAME FK_NAME,"
            + " RC.UNIQUE_CONSTRAINT_NAME PK_NAME,"
            + importedKeyNotDeferrable
            + " DEFERRABILITY"
            + " FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE KCU"
            + " INNER JOIN INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS RC"
            + " ON KCU.CONSTRAINT_SCHEMA = RC.CONSTRAINT_SCHEMA"
            + " AND KCU.CONSTRAINT_NAME = RC.CONSTRAINT_NAME"
            + " WHERE "
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src/main/java/org/mariadb/jdbc/MariaDbDatabaseMetaData.java [945:971]:
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    String sql =
        "SELECT KCU.REFERENCED_TABLE_SCHEMA PKTABLE_CAT, NULL PKTABLE_SCHEM,  KCU.REFERENCED_TABLE_NAME PKTABLE_NAME,"
            + " KCU.REFERENCED_COLUMN_NAME PKCOLUMN_NAME, KCU.TABLE_SCHEMA FKTABLE_CAT, NULL FKTABLE_SCHEM, "
            + " KCU.TABLE_NAME FKTABLE_NAME, KCU.COLUMN_NAME FKCOLUMN_NAME, KCU.POSITION_IN_UNIQUE_CONSTRAINT KEY_SEQ,"
            + " CASE update_rule "
            + "   WHEN 'RESTRICT' THEN 1"
            + "   WHEN 'NO ACTION' THEN 3"
            + "   WHEN 'CASCADE' THEN 0"
            + "   WHEN 'SET NULL' THEN 2"
            + "   WHEN 'SET DEFAULT' THEN 4"
            + " END UPDATE_RULE,"
            + " CASE DELETE_RULE"
            + "  WHEN 'RESTRICT' THEN 1"
            + "  WHEN 'NO ACTION' THEN 3"
            + "  WHEN 'CASCADE' THEN 0"
            + "  WHEN 'SET NULL' THEN 2"
            + "  WHEN 'SET DEFAULT' THEN 4"
            + " END DELETE_RULE,"
            + " RC.CONSTRAINT_NAME FK_NAME,"
            + " RC.UNIQUE_CONSTRAINT_NAME PK_NAME,"
            + importedKeyNotDeferrable
            + " DEFERRABILITY"
            + " FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE KCU"
            + " INNER JOIN INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS RC"
            + " ON KCU.CONSTRAINT_SCHEMA = RC.CONSTRAINT_SCHEMA"
            + " AND KCU.CONSTRAINT_NAME = RC.CONSTRAINT_NAME"
            + " WHERE "
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